Step 1. Plan The System; Step 2. Determine Required Network Devices; Step 3. Layout Communications And Power Wiring; Lonworks - Honeywell T7350 System Engineering

Refer to the Light Commercial Building Solution System
Communication Guide form 71-3123 and the E-Bus Wiring
Guidelines, form 74-2865 for a complete description of
network topology rules. Prepare Wiring Diagrams, for wiring
details. Plan to configure each controller. Refer to the Excel
L S ™ User Guide, form 74-2937, to configure the
ON PEC
T7350H, XL15 and XL10 Controllers.

Step 1. Plan the System

Plan the use of the T7350H Thermostat according to the job
requirements. Determine the location and functionality of each
device. Verify the sales estimate for the number of other
controllers and devices required. Check the number and type
of other required accessories. When planning the system
layout, consider potential expansion possibilities for future
growth. Planning is very important if HVAC systems and
controllers are to be added in future projects.
NOTEBOOK PC
RS-232
SERIAL
PORT
Fig. 4. Connecting personal computer to LonWorks® bus.
NOTEBOOK PC
RS-232
MODEM
RS-232

LonWorks

BUS
I/O CONNECTIONS
SHIELDED
INTERFACE
T7350H
CABLE
Q7760
SLTA
CABLE
PART
LonWorks
NO. 205979
BUS PORT
T7350H
SLTA
MODEM
T7350H
SLTA
Fig. 5. Typical topology for T7350 devices in L
T7350 COMMERCIAL PROGRAMMABLE THERMOSTAT

Step 2. Determine Required Network Devices

A maximum of 60 nodes can communicate on a single
®
L W Bus segment. Each L
ON ORKS
comprises one node. If more than 60 nodes are needed, a
Q7751A Router or Q7740 Repeater is necessary. A router or
repeater allows up to 120 controller nodes per network,
divided between two L
that routers are not supported by the LCBS L
system configuration tool. Refer to the Light Commercial
Building Solution System Communication Guide form 71-3123
for LCBS details. Refer to the E-Bus Wiring Guidelines, form
74-2865, for a complete description of network topology rules
and maximum wire lengths. A 209541B Termination Module
may be required. Refer to the Excel 10 FTT Termination
Module Installation Instructions form, 95-7554.
Step 3. Layout Communications and Power
Wiring:
ORKS ®
L W
ON
The communications L
that uses transformer isolation and differential Manchester
encoding. The Free Topology Transceiver (FTT) L
communications Bus supports a polarity insensitive, free
topology wiring scheme, refer to the E-Bus Wiring Guidelines
form, 74-2865, for a complete description of L
network topology rules. Fig. 5 shows T7350H devices
connected in a typical free topology L
M22492
T7350H T7350H
LonWorks BUS
MODEM
SLTA
RS-232
T7350H T7350H
LonWorks BUS
W
ON
11
W
ON ORKS
®
W Bus segments. Please note
ON ORKS
Bus Layout
®
W Bus, is a 78-kilobit network
ON ORKS
W
ON ORKS
T7350H
T7350H
LonWorks BUS
T7350H
JACK FOR OPERATOR TERMINAL
®
network.
ORKS
®
Bus device
S ™
ON PEC
®
W
ON ORKS
ORKS ®
W
ON
®
network.
T7770
WITH NO
LonWorks
BUS ACCESS
T7770
M22493
63-4368